//
// Theme.cs
//
// Author:
//   Aaron Bockover <abockover@novell.com>
//
// Copyright (C) 2007-2008 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Collections.Generic;
using Gtk;
using Gdk;
using Cairo;

namespace MonoDevelop.Components.Theming
{
	public enum SortType
	{
		None,
		Ascending,
		Descending
	}

	abstract class Theme
	{
		private static Cairo.Color black = new Cairo.Color (0, 0, 0);
		private Stack<ThemeContext> contexts = new Stack<ThemeContext> ();
		private GtkColors colors;

		private Cairo.Color selection_fill;
		private Cairo.Color selection_stroke;

		private Cairo.Color view_fill;
		private Cairo.Color view_fill_transparent;

		public GtkColors Colors {
			get { return colors; }
		}

		public Theme (Widget widget) : this(widget, new GtkColors ())
		{
		}

		public Theme (Widget widget, GtkColors colors)
		{
			this.colors = colors;
			this.colors.Refreshed += delegate { OnColorsRefreshed (); };
			this.colors.Widget = widget;
			
			PushContext ();
		}

		protected virtual void OnColorsRefreshed ()
		{
			selection_fill = colors.GetWidgetColor (GtkColorClass.Dark, StateType.Active);
			selection_stroke = colors.GetWidgetColor (GtkColorClass.Background, StateType.Selected);
			
			view_fill = colors.GetWidgetColor (GtkColorClass.Base, StateType.Normal);
			view_fill_transparent = view_fill;
			view_fill_transparent.A = 0;
		}

		#region Drawing

		public abstract void DrawPie (double fraction);

		public abstract void DrawArrow (Cairo.Context cr, Gdk.Rectangle alloc, SortType type);

		public void DrawFrame (Cairo.Context cr, Gdk.Rectangle alloc, bool baseColor)
		{
			DrawFrameBackground (cr, alloc, baseColor);
			DrawFrameBorder (cr, alloc);
		}

		public void DrawFrame (Cairo.Context cr, Gdk.Rectangle alloc, Cairo.Color color)
		{
			DrawFrameBackground (cr, alloc, color);
			DrawFrameBorder (cr, alloc);
		}

		public void DrawFrameBackground (Cairo.Context cr, Gdk.Rectangle alloc, bool baseColor)
		{
			DrawFrameBackground (cr, alloc, baseColor ? colors.GetWidgetColor (GtkColorClass.Base, StateType.Normal) : colors.GetWidgetColor (GtkColorClass.Background, StateType.Normal));
		}

		public void DrawFrameBackground (Cairo.Context cr, Gdk.Rectangle alloc, Cairo.Color color)
		{
			DrawFrameBackground (cr, alloc, color, null);
		}

		public void DrawFrameBackground (Cairo.Context cr, Gdk.Rectangle alloc, Cairo.Pattern pattern)
		{
			DrawFrameBackground (cr, alloc, black, pattern);
		}

		public abstract void DrawFrameBackground (Cairo.Context cr, Gdk.Rectangle alloc, Cairo.Color color, Cairo.Pattern pattern);

		public abstract void DrawFrameBorder (Cairo.Context cr, Gdk.Rectangle alloc);

		public abstract void DrawFrameBorderFocused (Cairo.Context cr, Gdk.Rectangle alloc);

		public abstract void DrawHeaderBackground (Cairo.Context cr, Gdk.Rectangle alloc);

		public abstract void DrawColumnHeaderFocus (Cairo.Context cr, Gdk.Rectangle alloc);

		public abstract void DrawHeaderSeparator (Cairo.Context cr, Gdk.Rectangle alloc, int x);

		public void DrawListBackground (Cairo.Context cr, Gdk.Rectangle alloc, bool baseColor)
		{
			DrawListBackground (cr, alloc, baseColor ? colors.GetWidgetColor (GtkColorClass.Base, StateType.Normal) : colors.GetWidgetColor (GtkColorClass.Background, StateType.Normal));
		}

		public abstract void DrawListBackground (Cairo.Context cr, Gdk.Rectangle alloc, Cairo.Color color);

		public void DrawColumnHighlight (Cairo.Context cr, double cellWidth, double cellHeight)
		{
			Gdk.Rectangle alloc = new Gdk.Rectangle ();
			alloc.Width = (int)cellWidth;
			alloc.Height = (int)cellHeight;
			DrawColumnHighlight (cr, alloc);
		}

		public void DrawColumnHighlight (Cairo.Context cr, Gdk.Rectangle alloc)
		{
			DrawColumnHighlight (cr, alloc, colors.GetWidgetColor (GtkColorClass.Background, StateType.Selected));
		}

		public abstract void DrawColumnHighlight (Cairo.Context cr, Gdk.Rectangle alloc, Cairo.Color color);

		public void DrawRowSelection (Cairo.Context cr, int x, int y, int width, int height)
		{
			DrawRowSelection (cr, x, y, width, height, true);
		}

		public void DrawRowSelection (Cairo.Context cr, int x, int y, int width, int height, bool filled)
		{
			DrawRowSelection (cr, x, y, width, height, filled, true, colors.GetWidgetColor (GtkColorClass.Background, StateType.Selected), CairoCorners.All);
		}

		public void DrawRowSelection (Cairo.Context cr, int x, int y, int width, int height, bool filled, bool stroked, Cairo.Color color)
		{
			DrawRowSelection (cr, x, y, width, height, filled, stroked, color, CairoCorners.All);
		}

		public void DrawRowCursor (Cairo.Context cr, int x, int y, int width, int height)
		{
			DrawRowCursor (cr, x, y, width, height, colors.GetWidgetColor (GtkColorClass.Background, StateType.Selected));
		}

		public void DrawRowCursor (Cairo.Context cr, int x, int y, int width, int height, Cairo.Color color)
		{
			DrawRowCursor (cr, x, y, width, height, color, CairoCorners.All);
		}

		public abstract void DrawRowCursor (Cairo.Context cr, int x, int y, int width, int height, Cairo.Color color, CairoCorners corners);

		public abstract void DrawRowSelection (Cairo.Context cr, int x, int y, int width, int height, bool filled, bool stroked, Cairo.Color color, CairoCorners corners);

		public abstract void DrawRowRule (Cairo.Context cr, int x, int y, int width, int height);

		public Cairo.Color ViewFill {
			get { return view_fill; }
		}

		public Cairo.Color ViewFillTransparent {
			get { return view_fill_transparent; }
		}

		public Cairo.Color SelectionFill {
			get { return selection_fill; }
		}

		public Cairo.Color SelectionStroke {
			get { return selection_stroke; }
		}

		public virtual int BorderWidth {
			get { return 1; }
		}

		public virtual int InnerBorderWidth {
			get { return 4; }
		}

		public int TotalBorderWidth {
			get { return BorderWidth + InnerBorderWidth; }
		}

		#endregion

		#region Contexts

		public void PushContext ()
		{
			PushContext (new ThemeContext ());
		}

		public void PushContext (ThemeContext context)
		{
			lock (this) {
				contexts.Push (context);
			}
		}

		public ThemeContext PopContext ()
		{
			lock (this) {
				return contexts.Pop ();
			}
		}

		public ThemeContext Context {
			get {
				lock (this) {
					return contexts.Peek ();
				}
			}
		}

		#endregion

		#region Static Utilities

		public static double Clamp (double min, double max, double value)
		{
			return Math.Max (min, Math.Min (max, value));
		}
		
		#endregion
		
	}
}
